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Multiple vulnerabilities in Takebishi Electric DeviceXplorer MELSEC OPC
server
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OPC servers provide a standard way to interoperate automation and control
systems, bridging data from several industrial protocols such as DNP3,
MODBUS, etc. to a more standard data access interface. They are often used
in SCADA systems to consolidate network device information in a single
point; as such OPC servers are usually considered critical applications.
Takebishi Electric commercialises an OPC Server ("Takebishi.Melsec.1"), more
information is available at http://www.takebishi.co.jp/.
ANALYSIS
--------
The product presents various security vulnerabilities, allowing an attacker
with access to the OPC interface to arbitrarily read and write the process
memory, leading to the execution of attacker-provided code.
The vulnerabilities reside in the server implementation of the following OPC
Data Access interface methods:
* IOPCServer::RemoveGroup
By providing specially crafted OPC handles the attacker can force the server
to access arbitrary memory in read/write operations which can be leveraged
to execute arbitrary code in the OPC server.
VULNERABLE VERSIONS
-------------------
The vulnerability has been verified to be present in the following version
of the server:
Server name: DeviceXPlorer MELSEC OPC Server
OPC Server CLSID: {582516F0-849F-11D0-B627-0000F8211D82}
ProgID: Takebishi.Melsec.1
Version: 3.11.6
OS: Windows XP
The vulnerability was discovered during an OPC server group assessment for a
customer and is not known to be publicly exploited.
WORKAROUND
----------
The vendor has fixed the vulnerability and published an updated version.
ADDITIONAL INFORMATION
----------------------
This vulnerability was found and researched by:
Lluis Mora